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[4] CLEAN INSIDE OF COOLING SYSTEM AND CHANGE COOLANT
• Immediately after the engine is stopped, the coolant is at high temperature, so there is danger of burns if you
drain the coolant immediately.
Wait for the engine to cool down before draining the coolant.
• Do not suddenly remove the cap when the radiator water temperature is high. Boiling water will spurt out and
cause burns.
Wait for the water temperature to go down before removing the cap. When removing the cap, raise the lever
attached to the cap to fully release the internal pressure, then remove the cap.
• Replace the cooling water (coolant) every year or 2000 running hours whichever comes first.
• For the coolant mixture ratio of cooling water, see "Operation 8. Cold Weather Operation" in "[2] Coolant Mixture
Ratio in Cooling Water ".
Clean the cooling water circuit as follows.
Use tap water for the coolant.
Do not use river water, well water, or untreated water supplies.
1. Stop the machine on level ground and stop the engine.
2. Open the engine inspection cover.
3. Raise the lever (1) attached to the radiator cap to release the internal
pressure before removing the radiator cap (2), then remove radiator cap (2).
4. Remove the undercover.
5. Drain the water from the following two places.
(1) Open the drain valve (3).
(2) Open the drain valve on the engine.
For details of the position of the drain valve on the engine, see the
separate engine operation manual.
If there is antifreeze in the coolant, put containers to catch the water under
each of the drain valves.
6. After draining the water, close the two drain valves opened in Step 5, then
add tap water through the water filler to fill the radiator.
7. Open the two drain valves in Step 5, then start the engine, run at low idling,
and run water through the system to flush it for 10 minutes.
While running water through the cooling system to flush it, be careful to
adjust the water flow so that the radiator is always full.
While running water through the cooling system to flush it, be careful that
the water supply hose does not slip out of the water filler.
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